Saw-filing device



Bl I. BARGER..

SAW FILING DEVICE. APPLICATION FILED ocr. 9. I9I9.

1,354,9 1. I Patented. 0% 5,1920.

' 3 SHEETS-SHEET I.

B. J. BARGER.

' SAW FILING DEVICE. APPLICATION FILED QQT. 9. 1919- 1,354,941 Patented 0%. 5,1920.

3 SHEETS -SHEET 2.

umlllllllllllllllll I uldllllllllljlllllllllll B. J. BARGER.

WSAW FILING DEVICE.

APPLICATION FILED OCT. 9, I919.

Patented Oct. 5, 1920.

3 SHEETSSHEET 3.

ammmtoz a ike m 944 o UNITED STATES PATENT OFFICE.

BERNARD J. BARGER, OF EL PAS TEXAS, ASSIGNOR OF ONE-HALF TO JESSE C.

' DAUGHERTY, OF FORT BLISS, TEXAS.

SAW-FILING DEVICE.

Application filed October 9, 1919.

T 0 all whom it may concern:

Be it known that I, BERNARD J. BARGER, a citizen of the United States, residing at El Paso, in the county of El Paso and State of Texas, have invented certain new and useful Improvements in Saw-Filing Devices; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to saw filing devices.

One object of the invention is to generally improve upon devices of this character by providing an improved structure which is exceedingly convenient and practical while being strong, durable and comparatively inexpenswe.

A further object of the invention is to provide an improved device of this character which can be operated by any person of 0rdinary ability and having no knowledge of the required details regarding the filing of saws.

A further object is to provide an improved device of this character which is adapted to file saws of different toothpitches, by the interchanging of feeding screws or shafts of different thread-pitches.

Further objects and advantages may become apparent to persons who read the following details of description in connection with the accompanying drawings in which Figure 1 is a perspective view of my complete saw filing device, one of the files being in the filing engagement with the tooth of a saw held by the saw-clamp.

Fig. 2 is anenlarged transverse vertical sectional view, the section being taken substantially along the line 2-2 of Fig. 3.

Fig. 3 is a vertical sectional view, the section being taken substantially along the line 33 of Fig. 2.

Fig. 4 is a perspective detail view illustrat ing one of the file carriers on a fragment of the rotary shaft on which the file carriers are clamped.

Fig. 5 is a perspective detail View illustrating portions of the saw-clamp and bearing for the file-carrier-shaft.

Fig. 6 is a perspective view illustrating portions of the saw-clamp or holder detached.

Referring to these drawings in detail, in

Specification of Letters Patent.

Serial No. 329,438.

which similar reference characters correspond with similar parts throughout the several views, and in which the saw 1 may be of any ordinary kind and forms no part of this invention The device comprises a saw holder generally indicated by the numeral 2, a rotary screw-threaded shaft 3, internally screwthreaded bearings 4 with which the threads of the shaft 3 are meshed, arms 5 adjustably mounted on the shaft 8, file holders 6 pivotally mounted on the arms 5 as indicated at 7, guiding rods 8, helical compression springs 9, cushioning elements or springs 10, catches or retaining members 11 which are pivotally mounted at 12, and files 13, the latter preferably being triangular in cross section and preferably being rectilinear or non-circular as shown.

The saw clamp 2 is preferably formed of a stationary jaw 14 which includes clamps 15 which are adapted to be secured to a table or shaft for supporting the device. Moreover, the jaw member 14 includes a connecting bar 16 which extends from one to another of two posts 17 which have upward extensions which are apertured at 18, as indicated in Fig. 2, to receive bolts 19 by means of which the bearings 4 are removably secured to these posts. It will be seen that the posts 17 and bearings 4 are united by a ship-lap joint so that the bearings are immovable with relation to the posts 17 when secured by the bolts 19. However, these bearings 4 may very quickly and easily be removed and replaced by similar bearings (not shown) which have screw threads of a pitch corresponding with the tooth-pitch of the saw to be filed, as will hereinafter appear more clearly.

The front jaw of the saw holder 2 includes a clamping bar 20, and one or both of the clamping bars may be provided with an inner lining 21 of leather or other yieldable material which will frictionally engage with the saw to prevent it from slipping. The ends of the clamping bar 20 are rigidly united with front posts 22 which are pivotally connected at 23 to forward extensions of the clamping jaw 14. Screws 24 extend through the posts 22 and engage with the posts 17, cranks 25 being provided to operate the screws 24 and thereby move the front and rear jaws into clamping engagement with the saw.

A crank 26 is secured on the screw-threaded shaft 3, and the arms 5 are secured by suitable clamps 27 in adjustable engagement with the portion of the shaft 3 between its threaded end portions which have their threads in mesh with those of the bearings 4. Each file-holder 6 includes a bar 6 through which shanks of the clamps 29 extend, and which is pivotally and elastically connected to the arm 5, as shown. Although I have shown threearms 5 and the elements carried thereby, it is to be understood that any appropriate number of these file carriers may be mounted on the shaft 3, and that each one of these carriers effects its functions independently of the others, although theycooperate in that while or immediately after a tooth is being filed by one of these devices, another tooth is being filed by another of the file carriers, therefore the filing of a saw is more quickly accomplished by three or more file carriers than by one. Moreover, by arranging the arms 5 in such angular relation about the shaft 3 that one file comes into operation at the time another file is ceasing its filing operation, the resistance against rotation of the shaft 3 is sub stantially equalized so as to avoid the tiresome effect of a varying resistance.

In operating the device for filing a saw which is held by the clamp 2, the shaft 3 having threads corresponding in pitch with the tooth-pitch of the saw, the crank 26 is now turned or rotated, and 'each file 13 is pushed or turned longitudinally across a tooth of the saw while being yieldingly pressed downward against the saw by means of the spring 9. As this file 13 moves out of engagement with the saw, the spring 9 returns the file to its normal position in which the spring or cushioning element 10 bears against the front sideof the arm 5, it being understood that the arcuate rod 8 extends through an aperture in the arm 5, and that this aperture is smaller than the cross section of the spring 10. As the shaft 3 continues to rotate, it also moves longitudinally by reason of its threaded engagement with the bearings 4;, and when this arm 5 and its file carrier again bring the file into its filing engagement with the saw, this file is-engaged with the tooth next adjacent to the one it has previously filed. Similarly, the arm 5 which engages the saw at the time the file 13 has left the saw and in the previously described part of the operation, moves into filing engagement with successive teeth of the saw, each arm 5 similarly performing the function previously described until all of the teeth of the saw have been filed. In order to increase or decrease the pressure of the files on the saw, a tensioning nut 28 is provided for each rod 8 and has screwthreaded engagement therewith so that it may be adjusted to difierentpositions on the rod 8 for tensioning the spring 9. It should be understood that the files 13 are clamped by means of screw-actuated jaws 29 and are especially formed for holding a three-cornered file at-the proper angle, as shown in Fig. 3, for filing the saw teeth at the proper angle or giving them the desired rake. Obviously, the file clamping jaws 29 may be interchanged so as to hold files of different sizes and shapes at the different angles.

After the shaft 3 has moved longitudinally leftward to the limit of its threaded engagement with the bearingsl, it may be returned to its initial position by reversing the relative movement thereof. In order that the shaft may be thusreversed without interference of the files or file carriers with the saw holder, the catches 11 are adapted to engage with notches 8 in the rods 8 when the file holders 6 aresufiiciently raised, and by means of this engagement of the catches 11, the file holders-are retained in the position shown in Fig. at, while the shaft 3 is returned to its initial position.

The arms 5 and carriers 6 are somewhat 1 thin and yieldable, and therefore, the files 13 may be moved laterally a sufiicient dis tance to conform to irregularities of the teeth, and these elements are sufiiciently elastic to return to their initial position with relation to the shaft 3, so that the longitudinal movement of the shaft always brings each file into engagement with the tooth next adjacent to the one it has previously filed, each file being non-continuous, in contra distinction to a circular or continuous file or cutting tool.

Although I have described this embodiment of my invention very specifically, it is not intended to limit this invention to these exact details of construction and an rangement, but changes may be made within the scope of the inventive ideas as implied and claimed.

What I claim as my invention is:

1. In a saw-filing device, the combination of means to hold a saw, file, means to revolve the file and thereby effect its filing movement with relation to the teeth of the saw, the last said means including a rotary member supported in bearings near the sawholding means and being movable axially through said hearings to shift the file from one to another of the saw-teeth.

2. In a saw-filing device, the combination of means to hold a saw, a file, and means operable by a single actuator to effect filing movement of the file relative to the saw file and thereby effect its filing movement with relation to the teeth of the saw, the last said means including a rotary member provided with devices whicheooperate to shift the file from one to another of the saw teeth.

t. In a sawfiling device, the combination of means to hold a saw, a file, and means to revolve the file and thereby effect its filing movement with relation to the teeth of the saw, said means being provided with an elastic element which holds the file in yielding engagement with the tooth being filed.

5. In a saw-filing device, a file holder, a rotary member having its axis in a plane intersecting the length of a file in the fileholder, and means including a spring for securing the file holder yieldingly on said rotary member.

6. In a saw-filing device a pair of fileclamps, a bar on which said file-clamps are secured, a rotary arm pivotally connected to said bar, and a means including a spring to yiel'dingly hold said bar and arm in their normal relation to one another.

7. In a saw-filing device, a rotary shaft, radial arms adjustable with relation to one another on said shaft, and file holders elastically mounted on said radial arms.

8. In a saw-filing device, a rotary and longitudinally movable shaft, radial arms adjustable with relation to one another on said shaft, and file holders elastically mounted on said radial arms,

9. In a saw-filing device, a saw-holder, internally threaded bearings detachably secured thereto and adapted to be interchanged with similar bearings, an exterallv threaded shaft having its threads meshing with those of said bearings and being rotatable and longitudinally movable relative to said saw-holder, and means on said shaft to carry a file alternately into filiiig engagement with the teeth of a saw held by said saw-holder when said shaft is rotated.

10. In a sawfiling device, a saw-holder, internally threaded bearings secured there to, an externally threaded shaft having its threads meshing with those of said bearings and being rotatable and longitudinally movable relative to said saw-holder, means on said shaft to carry a file successively into filing engagement with the teeth of a saw held by said sawholder when said shaft is rotated, the file-carrying means including a retractable file holder and a catch, the latter being operatable to temporarily retain the file holder in its depressed position.

11. The combination of a saw-clamp adapted to hold saws of different toothpitches, said clamp having lateral extensions on one of its clamping jaws, internally threaded bearings removably secured on said extensions so as to be interchangeable with similar bearings having screw-threads whose pitches vary according to that of the saw to be held in said saw-clamp and filed, a shaft having screw-threaded engagement with the bearings on said jaws, and a plurality of file holders adjustably connected to said shaft so as to conform to variations of the saw-teeth.

12. In a filing device a rotary shaft, an arm carried thereby, a file-holder pivotally connected to said arm, an arcuate guiding rod secured to one of these pivotally connected members and extending through an aperture in the other, a helical compression spring around and guided by said arcuate rod, and means on said rod to limit the angular movement of the pivotally connected members relative to one another.

18. In a filing device a rotary shaft, an arm carried thereby, a file-holder pivotally connected to said arm, an arcuate guiding rod secured to one of these pivotally connected members and extending through an aperture in the other, a helical compression spring around and guided by said arcuate rod, and means on said rod to adjust the tension of said spring.

14. In a filing device, a rotary shaft, an arm carried thereby, a file-holder pivotally connected to said arm, an arcuate guiding rod secured to one of these pivotally connected members and extending through an aperture in the other, a helical compression spring around and guided by said arcuate rod, and means on said rod to limit the angular movement of the pivotally connected members relative to one another, said means including a cushioning element at the opposite side of the said arm from said compression spring. i

In testimony whereof I have hereunto set my hand.

BERNARD J. BARGER. 

